/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/AbilitySystemComponent.h
Register a tag event and immediately call it
[FDelegateHandle](API\Runtime\Core\Delegates\FDelegateHandle) RegisterAndCallGameplayTagEvent ( [FGameplayTag](API\Runtime\GameplayTags\FGameplayTag) Tag, FOnGameplayEffectTagCountChanged::FDelegate Delegate, [EGameplayTagEventType::Type](API\Plugins\GameplayAbilities\EGameplayTagEventType__Type) EventType )